Gorgeous Jennifer Garner stopped by The Late Show with David Letterman to promote her latest film Arthur, but talk quickly turned to co-star Russell Brand's anatomy.

When asked about a certain scene in which she's on all fours with the British comedian, Garner tells Letterman:

"He was in his underwear, and they were very handsomely made. It was Russell and me, right behind him, on all fours. We did it over and over again, so I spent two days just right up against it. So I'm very familiar, in my own way, with the anatomy of Russell Brand -- and it's good."

Not sure how hubby Ben Affleck is handling that one. The dimpled 38-year-old cutie also tells Dave about her unusual job in college. Find out which job that was ... after the jump.

When asked about her craziest job in college, Jennifer tells Dave:

â€œMy college roommate and Iâ€¦.weâ€™re theater geeks and we had a key to the theater department. We would go in late at night and we would use their sewing machines and their elastic and we would make scrunchiesâ€¦.We would make boxes full of scrunchies in sorority colors or [ones that were] just cute."